The population of a country decreased from 162 million to 157 million over the course of 20 years. What was the percentage decrease?

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  • Anonymous
    1 month ago

    You've got to be kidding?  What grade are you in?  4?

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  • 1 month ago

    Here's the formula for any percentage change problem:

    (new - old) / old × 100%

    Basically you figure out the amount of the change, divide it by the original amount then multiply it by 100% to make it a percentage.

    Note: This works for an increase or a decrease. If it is an increase, the resulting number is positive. If it is a decrease, the resulting number is negative.

    In your case:

    old = 162 (million)

    new = 157 (million)

    Plug in your values:

    (162 - 157) / 162 × 100%

    = -5 / 162 × 100%

    ≈ -0.030864 × 100%

    ≈ -3.0864%

    We can round that to something reasonable, like 1 decimal place:

    ≈ -3.1%

    So the percentage change is -3.1%.

    That means the population *decreased* by 3.1%

    Answer:

    Approximately a 3.1% decrease in population.

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  • GTB
    Lv 7
    1 month ago

    (157-162)(100)/162 = = -3.09%

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  • 1 month ago

    The population of a country decreased from 162 million to 157 million

    over the course of 20 years.

    The percentage decrease was 3.086419753.

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  • David
    Lv 7
    1 month ago

    Population decrease: (162-157)/162 times 100 = about 3.1%

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